import java.util.Arrays;
   public class CLSumRecursion {
       public static void main(String [] args) {
           int sum = 0;
  
           if(args.length < 1){
               System.out.println("Usage: java CLSumRecursion num1 num2 ...");
               System.exit(0);
          }
 
          int [] tmp = new int [args.length];
          for(int i=0; i<args.length; i++) {
              tmp[i] = Integer.parseInt(args[i]);
         }
 
          sum =  clsum(tmp);
          System.out.println(sum);
      }
 
      public static int clsum(int [] arr){
 
         if (arr.length == 1)
              return arr[0];
          else {
              int [] tmp = Arrays.copyOf(arr, arr.length-1);
              return clsum(tmp) + arr[arr.length-1];
          }
      }
  }
